window.onload = function () {
  //蛛网

  // ! function() {
  //     //封装方法，压缩之后减少文件大小
  //     function get_attribute(node, attr, default_value) {
  //       return node.getAttribute(attr) || default_value;
  //     }
  //     //封装方法，压缩之后减少文件大小
  //     function get_by_tagname(name) {
  //       return document.getElementsByTagName(name);
  //     }
  //     //获取配置参数
  //     function get_config_option() {
  //       var scripts = get_by_tagname("script"),
  //         script_len = scripts.length,
  //         script = scripts[script_len - 1]; //当前加载的script
  //       return {
  //         l: script_len, //长度，用于生成id用
  //         z: get_attribute(script, "zIndex", -1), //z-index
  //         o: get_attribute(script, "opacity", 0.8), //opacity
  //         c: get_attribute(script, "color", "0,0,0"), //color
  //         n: get_attribute(script, "count", 150) //count
  //       };
  //     }
  //     //设置canvas的高宽
  //     function set_canvas_size() {
  //       canvas_width = the_canvas.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
  //       canvas_height = the_canvas.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
  //     }

  //     //绘制过程
  //     function draw_canvas() {
  //       context.clearRect(0, 0, canvas_width, canvas_height);
  //       //随机的线条和当前位置联合数组
  //       var e, i, d, x_dist, y_dist, dist; //临时节点
  //       //遍历处理每一个点
  //       random_points.forEach(function(r, idx) {
  //         r.x += r.xa,
  //         r.y += r.ya, //移动
  //         r.xa *= r.x > canvas_width || r.x < 0 ? -1 : 1,
  //         r.ya *= r.y > canvas_height || r.y < 0 ? -1 : 1, //碰到边界，反向反弹
  //         context.fillRect(r.x - 0.5, r.y - 0.5, 1, 1); //绘制一个宽高为1的点
  //         //从下一个点开始
  //         for (i = idx + 1; i < all_array.length; i++) {
  //           e = all_array[i];
  //           // 当前点存在
  //           if (null !== e.x && null !== e.y) {
  //             x_dist = r.x - e.x; //x轴距离 l
  //             y_dist = r.y - e.y; //y轴距离 n
  //             dist = x_dist * x_dist + y_dist * y_dist; //总距离, m

  //             dist < e.max && (e === current_point && dist >= e.max / 2 && (r.x -= 0.03 * x_dist, r.y -= 0.03 * y_dist), //靠近的时候加速
  //               d = (e.max - dist) / e.max,
  //               context.beginPath(),
  //               context.lineWidth = d / 2,
  //               context.strokeStyle = "rgba(" + config.c + "," + (d + 0.2) + ")",
  //               context.moveTo(r.x, r.y),
  //               context.lineTo(e.x, e.y),
  //               context.stroke());
  //           }
  //         }
  //       }), frame_func(draw_canvas);
  //     }
  //     //创建画布，并添加到body中
  //     var the_canvas = document.createElement("canvas"), //画布
  //       config = get_config_option(), //配置
  //       canvas_id = "c_n" + config.l, //canvas id
  //       context = the_canvas.getContext("2d"), canvas_width, canvas_height,
  //       frame_func = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(func) {
  //         window.setTimeout(func, 1000 / 45);
  //       }, random = Math.random,
  //       current_point = {
  //         x: null, //当前鼠标x
  //         y: null, //当前鼠标y
  //         max: 20000 // 圈半径的平方
  //       },
  //       all_array;
  //     the_canvas.id = canvas_id;
  //     the_canvas.style.cssText = "position:fixed;top:0;left:0;z-index:" + config.z + ";opacity:" + config.o;
  //     get_by_tagname("body")[0].appendChild(the_canvas);

  //     //初始化画布大小
  //     set_canvas_size();
  //     window.onresize = set_canvas_size;
  //     //当时鼠标位置存储，离开的时候，释放当前位置信息
  //     window.onmousemove = function(e) {
  //       e = e || window.event;
  //       current_point.x = e.clientX;
  //       current_point.y = e.clientY;
  //     }, window.onmouseout = function() {
  //       current_point.x = null;
  //       current_point.y = null;
  //     };
  //     //随机生成config.n条线位置信息
  //     for (var random_points = [], i = 0; config.n > i; i++) {
  //       var x = random() * canvas_width, //随机位置
  //         y = random() * canvas_height,
  //         xa = 2 * random() - 1, //随机运动方向
  //         ya = 2 * random() - 1;
  //       // 随机点
  //       random_points.push({
  //         x: x,
  //         y: y,
  //         xa: xa,
  //         ya: ya,
  //         max: 6000 //沾附距离
  //       });
  //     }
  //     all_array = random_points.concat([current_point]);
  //     //0.1秒后绘制
  //     setTimeout(function() {
  //       draw_canvas();
  //     }, 100);
  //   }();

  // ----------------------------------------------------------------------------------------------------------------------------------------

  //彩带

  (function (name, factory) {
    if (typeof window === "object") {
      window[name] = factory();
    }
  })("Ribbons", function () {
    var _w = window,
      _b = document.body,
      _d = document.documentElement;
    var random = function () {
      if (arguments.length === 1) {
        if (Array.isArray(arguments[0])) {
          var index = Math.round(random(0, arguments[0].length - 1));
          return arguments[0][index];
        }
        return random(0, arguments[0]);
      } else if (arguments.length === 2) {
        return Math.random() * (arguments[1] - arguments[0]) + arguments[0];
      }
      return 0;
    };
    var screenInfo = function (e) {
      var width = Math.max(
          0,
          _w.innerWidth || _d.clientWidth || _b.clientWidth || 0
        ),
        height = Math.max(
          0,
          _w.innerHeight || _d.clientHeight || _b.clientHeight || 0
        ),
        scrollx =
          Math.max(0, _w.pageXOffset || _d.scrollLeft || _b.scrollLeft || 0) -
          (_d.clientLeft || 0),
        scrolly =
          Math.max(0, _w.pageYOffset || _d.scrollTop || _b.scrollTop || 0) -
          (_d.clientTop || 0);
      return {
        width: width,
        height: height,
        ratio: width / height,
        centerx: width / 2,
        centery: height / 2,
        scrollx: scrollx,
        scrolly: scrolly,
      };
    };
    var mouseInfo = function (e) {
      var screen = screenInfo(e),
        mousex = e ? Math.max(0, e.pageX || e.clientX || 0) : 0,
        mousey = e ? Math.max(0, e.pageY || e.clientY || 0) : 0;
      return {
        mousex: mousex,
        mousey: mousey,
        centerx: mousex - screen.width / 2,
        centery: mousey - screen.height / 2,
      };
    };
    var Point = function (x, y) {
      this.x = 0;
      this.y = 0;
      this.set(x, y);
    };
    Point.prototype = {
      constructor: Point,
      set: function (x, y) {
        this.x = x || 0;
        this.y = y || 0;
      },
      copy: function (point) {
        this.x = point.x || 0;
        this.y = point.y || 0;
        return this;
      },
      multiply: function (x, y) {
        this.x *= x || 1;
        this.y *= y || 1;
        return this;
      },
      divide: function (x, y) {
        this.x /= x || 1;
        this.y /= y || 1;
        return this;
      },
      add: function (x, y) {
        this.x += x || 0;
        this.y += y || 0;
        return this;
      },
      subtract: function (x, y) {
        this.x -= x || 0;
        this.y -= y || 0;
        return this;
      },
      clampX: function (min, max) {
        this.x = Math.max(min, Math.min(this.x, max));
        return this;
      },
      clampY: function (min, max) {
        this.y = Math.max(min, Math.min(this.y, max));
        return this;
      },
      flipX: function () {
        this.x *= -1;
        return this;
      },
      flipY: function () {
        this.y *= -1;
        return this;
      },
    };
    var Factory = function (options) {
      this._canvas = null;
      this._context = null;
      this._sto = null;
      this._width = 0;
      this._height = 0;
      this._scroll = 0;
      this._ribbons = [];
      this._options = {
        colorSaturation: "80%",
        colorBrightness: "60%",
        colorAlpha: 0.65,
        colorCycleSpeed: 6,
        verticalPosition: "center",
        horizontalSpeed: 200,
        ribbonCount: 4,
        strokeSize: 0,
        parallaxAmount: -0.5,
        animateSections: true,
      };
      this._onDraw = this._onDraw.bind(this);
      this._onResize = this._onResize.bind(this);
      this._onScroll = this._onScroll.bind(this);
      this.setOptions(options);
      this.init();
    };
    Factory.prototype = {
      constructor: Factory,
      setOptions: function (options) {
        if (typeof options === "object") {
          for (var key in options) {
            if (options.hasOwnProperty(key)) {
              this._options[key] = options[key];
            }
          }
        }
      },
      init: function () {
        try {
          this._canvas = document.createElement("canvas");
          this._canvas.style["display"] = "block";
          this._canvas.style["position"] = "fixed";
          this._canvas.style["margin"] = "0";
          this._canvas.style["padding"] = "0";
          this._canvas.style["border"] = "0";
          this._canvas.style["outline"] = "0";
          this._canvas.style["left"] = "0";
          this._canvas.style["top"] = "0";
          this._canvas.style["width"] = "100%";
          this._canvas.style["height"] = "100%";
          this._canvas.style["z-index"] = "-2";
          // this._canvas.style["background-color"] = "#F0F8FF";
          this._canvas.id = "bgCanvas";
          this._onResize();
          this._context = this._canvas.getContext("2d");
          this._context.clearRect(0, 0, this._width, this._height);
          this._context.globalAlpha = this._options.colorAlpha;
          // 这里可以设置是否随着窗口的滚动而滚动
          window.addEventListener("resize", this._onResize);
          window.addEventListener("scroll", this._onScroll);
          // 这里设置添加的位置
          var body_ = document.getElementsByTagName("body")[0];
          body_.appendChild(this._canvas);
        } catch (e) {
          console.warn("Canvas Context Error: " + e.toString());
          return;
        }
        this._onDraw();
      },
      addRibbon: function () {
        var dir = Math.round(random(1, 9)) > 5 ? "right" : "left",
          stop = 1000,
          hide = 200,
          min = 0 - hide,
          max = this._width + hide,
          movex = 0,
          movey = 0,
          startx = dir === "right" ? min : max,
          starty = Math.round(random(0, this._height));
        if (/^(top|min)$/i.test(this._options.verticalPosition)) {
          starty = 0 + hide;
        } else if (/^(middle|center)$/i.test(this._options.verticalPosition)) {
          starty = this._height / 2;
        } else if (/^(bottom|max)$/i.test(this._options.verticalPosition)) {
          starty = this._height - hide;
        }
        var ribbon = [],
          point1 = new Point(startx, starty),
          point2 = new Point(startx, starty),
          point3 = null,
          color = Math.round(random(0, 360)),
          delay = 0;
        while (true) {
          if (stop <= 0) break;
          stop--;
          movex = Math.round(
            (Math.random() * 1 - 0.2) * this._options.horizontalSpeed
          );
          movey = Math.round((Math.random() * 1 - 0.5) * (this._height * 0.25));
          point3 = new Point();
          point3.copy(point2);
          if (dir === "right") {
            point3.add(movex, movey);
            if (point2.x >= max) break;
          } else if (dir === "left") {
            point3.subtract(movex, movey);
            if (point2.x <= min) break;
          }
          ribbon.push({
            point1: new Point(point1.x, point1.y),
            point2: new Point(point2.x, point2.y),
            point3: point3,
            color: color,
            delay: delay,
            dir: dir,
            alpha: 0,
            phase: 0,
          });
          point1.copy(point2);
          point2.copy(point3);
          delay += 4;
          color += this._options.colorCycleSpeed;
        }
        this._ribbons.push(ribbon);
      },
      _drawRibbonSection: function (section) {
        if (section) {
          if (section.phase >= 1 && section.alpha <= 0) {
            return true;
          }
          if (section.delay <= 0) {
            section.phase += 0.02;
            section.alpha = Math.sin(section.phase) * 1;
            section.alpha = section.alpha <= 0 ? 0 : section.alpha;
            section.alpha = section.alpha >= 1 ? 1 : section.alpha;
            if (this._options.animateSections) {
              var mod = Math.sin(1 + (section.phase * Math.PI) / 2) * 0.1;
              if (section.dir === "right") {
                section.point1.add(mod, 0);
                section.point2.add(mod, 0);
                section.point3.add(mod, 0);
              } else {
                section.point1.subtract(mod, 0);
                section.point2.subtract(mod, 0);
                section.point3.subtract(mod, 0);
              }
              section.point1.add(0, mod);
              section.point2.add(0, mod);
              section.point3.add(0, mod);
            }
          } else {
            section.delay -= 0.5;
          }
          var s = this._options.colorSaturation,
            l = this._options.colorBrightness,
            c =
              "hsla(" +
              section.color +
              ", " +
              s +
              ", " +
              l +
              ", " +
              section.alpha +
              " )";
          this._context.save();
          if (this._options.parallaxAmount !== 0) {
            this._context.translate(
              0,
              this._scroll * this._options.parallaxAmount
            );
          }
          this._context.beginPath();
          this._context.moveTo(section.point1.x, section.point1.y);
          this._context.lineTo(section.point2.x, section.point2.y);
          this._context.lineTo(section.point3.x, section.point3.y);
          this._context.fillStyle = c;
          this._context.fill();
          if (this._options.strokeSize > 0) {
            this._context.lineWidth = this._options.strokeSize;
            this._context.strokeStyle = c;
            this._context.lineCap = "round";
            this._context.stroke();
          }
          this._context.restore();
        }
        return false;
      },
      _onDraw: function () {
        for (var i = 0, t = this._ribbons.length; i < t; ++i) {
          if (!this._ribbons[i]) {
            this._ribbons.splice(i, 1);
          }
        }
        this._context.clearRect(0, 0, this._width, this._height);
        for (var a = 0; a < this._ribbons.length; ++a) {
          var ribbon = this._ribbons[a],
            numSections = ribbon.length,
            numDone = 0;
          for (var b = 0; b < numSections; ++b) {
            if (this._drawRibbonSection(ribbon[b])) {
              numDone++;
            }
          }
          if (numDone >= numSections) {
            this._ribbons[a] = null;
          }
        }
        if (this._ribbons.length < this._options.ribbonCount) {
          this.addRibbon();
        }
        requestAnimationFrame(this._onDraw);
      },
      _onResize: function (e) {
        var screen = screenInfo(e);
        this._width = screen.width;
        this._height = screen.height;
        if (this._canvas) {
          this._canvas.width = this._width;
          this._canvas.height = this._height;
          if (this._context) {
            this._context.globalAlpha = this._options.colorAlpha;
          }
        }
      },
      _onScroll: function (e) {
        var screen = screenInfo(e);
        this._scroll = screen.scrolly;
      },
    };
    return Factory;
  });
  new Ribbons();

  // ---------------------------------------------------------------------------------------
};
